diag color

[phi gcc]

Hi Jon,

On Sun, Jul 31, 2016 at 1:16 PM, Jonathan Wakely
> The manual says "Setting GCC_COLORS to the empty string disables colors."
>
> Did you try that? Setting it to an empty string in your env should
> disable the coloured output.

Yes it works, sounds a less intrusive one :) regarding old version
compatibility, will export that.

When looking quick at the src I din't spotted this getenv() that is
not in the init() path as it should :)

Thanx
Phi